Valve for compound engines



(No Model.)

A. L. CHURCH. VALVE POR GOMPUUND ENGINES.

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ARTHUR L. CHURCH, O F PHILADELPHIA, PENNSYLVANIA.

` VALVE FORCOMPOUND ENGINES.

SPECIFICATION forming part of Letters Patent No. 471,842, dated March 29, 1892.

Application filed November 26, 1889. Serial No. 331,630. (No model.) l

.T0 a/ZZ whom t may concern,.- Y

Be it known that I, ARTHUR L. CHURCH, a citizen of the United States, and a resident ot Philadelphia, Pennsylvania, have invented certain Improvements in Valves for Compound Engines, of which the following is a specication.

The object of my invention is to construct a valve especially adapted for use in connection with tandem compound engines, my invention being especially applicable for use with compound locomotive-engines; but it can also be applied to stationary and marine engines.

In theaccompanying drawings, Figurel is a longitudinal section of the high and low pressure cylinders and valve, the valve being shown on dead-center. Fig. 2 is a section view showing the valve moved to admit steam in the rear of the pistons. Fig. 3 is a view showing the valve moved to admit steam in front of the pistons.

A is the high-pressure cylinder, and B the low-pressure cylinder, arranged in line with each other. The piston-rod D passes from one cylinder to the other and carries the pistons a and b.

E is the valve-chest, and F is the valve, and is what is termed a piston-valve.

e e are the steam-inlet ports, and C the exhaust-port. d cl communicate with the opposite ends of the high-pressure cylinder, and the ports g g connect with the opposite ends of the low-pressure cylinder. The .valve F has an internal passage f and has a series of annular grooves t, t', and t2. The groove t' communicates with the internal passage f through the openings j. .The groove i forms a communication at times between the steaminlet port e and the port d of the high-pressure cylinder,and the groove 712 forms a oommunication between the ports of the lowpressure cylinder and the exhaust, but does not communicate with the internal passage.. Passagesj and t7'2 form inlet communications with the ports g g of the low-pressure cylinder from the central passage f of the valve, the valve F being closed at both ends, as shown in the drawings. It will be noticed that the steam-inlet ports are in one-half yof the valve-casing, as are also the high-pressure ports, while the low-pressure ports and the exhaust-ports are in the opposite half .of the valve-casing, so .that by arranging the cylinders in tandem, as shown, direct commuinders themselves may vary. They may be l placed near together or far apart or out of line, depending altogether upon the particular construction of engine to which my improved valve applies. If the valve is moved from the position shown in Fig. l in the direction of the arrow to the position shown in Fig. 2, steam will be admitted to .the highpressurev cylinder through the portsd and e and the steam will exhaust from the highpressure cylinder into the low-pressure cylinder through the port d', the space 7l, and passage j to the central passage f of the valve through the passage j to the port g of the low-pressure cylinderto the rear of the piston. The steam exhausts from this cylinder through the passage g and space i2 to the exhaust C. The pistons will consequentlymove forward. If the valve is moved to the position shown in Fig. 3, steam will be admitted through the steam-inlet port e and port d of the high-pressure cylinder in front of its piston, while the exhaust-steam from this cylinder will pass to the low-pressure cylinder through the port d, space t', passage j, central passage f in the valve, and passagej2 through the port g to the low-pressure cylinder in front of its piston, and steam will exhaust from this cylinder through the port g and space cl2.

I claim as my inventionf The combination, in a valve structure for compound engines, of the valve-chest having at one end two live-steam-admission ports e e and two inlet and exhaust'ports d d vfor the high-pressure cylinder situated between the two live-steam-admission ports and having at the opposite end an exhaust-port C and two inlet and exhaust ports g g for the lowpressure cylinder, one on each side of the exhaust-port C, with a hollow valve F, closed at each end, forming a passage f and having grooves it" i2, and openin gs j j f2 in the valve for the passage of steam from the high-pressure cylinder to the lowpressure cylinder, substantially as described.

In testimony whereof vI have signed my name to this specification in the presence of two subscribing witnesses.

' z ARTHUR L. CHURCH.

Witnesses: Y

HENRY HowsoN, R. SCHLEICHER.

IOO 

